CI: glance on overcloud fails with AttributeError: 'NoneType' object has no attribute 'Rados'

[Sagi (Sergey) Shnaidman]

http://logs.openstack.org/periodic/periodic-tripleo-ci-centos-7-ovb-1ctlr_1comp_1ceph-featureset024/43660e1/logs/undercloud/home/jenkins/overcloud_validate.log.txt.gz#_2017-08-21_08_11_18

2017-08-21 08:11:18 | 500 Internal Server Error: The server has either erred or is incapable of performing the requested operation. (HTTP 500)

http://logs.openstack.org/periodic/periodic-tripleo-ci-centos-7-ovb-1ctlr_1comp_1ceph-featureset024/43660e1/logs/overcloud-controller-0/var/log/glance/api.log.txt.gz#_2017-08-21_08_11_18_116

Glance API fails with:

AttributeError: 'NoneType' object has no attribute 'Rados'

I see only librados2 installed, no python-rados.
http://logs.openstack.org/periodic/periodic-tripleo-ci-centos-7-ovb-1ctlr_1comp_1ceph-featureset024/43660e1/logs/overcloud-controller-0/var/log/host_info.txt.gz